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Investment in and Advances to Non-Consolidated Entities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Nov. 30, 2014
Aug. 31, 2013
Investments in and Advances to Affiliates [Line Items]        
Advances to affiliate $ 61,735us-gaap_AdvancesToAffiliate      
Investment in joint venture 3,032us-gaap_PaymentsToAcquireEquityMethodInvestments 0us-gaap_PaymentsToAcquireEquityMethodInvestments    
Houston, TX [Member]        
Investments in and Advances to Affiliates [Line Items]        
Anticipated construction cost     86,491lxp_RealEstateInvestmentsJointVenturesAnticipatedConstructionCost
/ invest_InvestmentGeographicRegionAxis
= lxp_HoustonTexasMember
 
Maximum construction financing 56,686lxp_RealEstateInvestmentsJointVenturesMaximumConstructionFinancing
/ invest_InvestmentGeographicRegionAxis
= lxp_HoustonTexasMember
     
Joint Venture [Member] | Houston, TX [Member]        
Investments in and Advances to Affiliates [Line Items]        
Ownership percentage of equity method investment 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= lxp_HoustonTexasMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lxp_JointVentureMember
     
Lease term (years)     20 years  
Joint Venture [Member] | Baltimore, Maryland [Member]        
Investments in and Advances to Affiliates [Line Items]        
Lease term (years)       99 years
Investment in joint venture       5,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ invest_InvestmentGeographicRegionAxis
= lxp_BaltimoreMarylandMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lxp_JointVentureMember
Lexington Realty Trust [Member]        
Investments in and Advances to Affiliates [Line Items]        
Advances to affiliate $ 14,152us-gaap_AdvancesToAffiliate
/ dei_LegalEntityAxis
= lxp_LexingtonRealtyTrustMember
     
Minimum [Member]        
Investments in and Advances to Affiliates [Line Items]        
Ownership percentage of equity method investment 15.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Maximum [Member]        
Investments in and Advances to Affiliates [Line Items]        
Ownership percentage of equity method investment 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Mortgages [Member]        
Investments in and Advances to Affiliates [Line Items]        
Stated interest rate 3.70%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
     
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 5.20%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember